Process of manufacturing perborate of zinc.



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WALTER WEBER, OF DUSSELDORF, GERMANY. ASSIGNOR TO THE FIRM F HENKEL & CIE, OF DUSSELDORF, GERMANY.

PROCESS OF MANUFACTURING PERBOR-ATE ZINC.

No Drawing.

To (Ill 'UllO/JL it may concern Be it known that I, lVAL'run \Vuuua, a citizen of the German Empire, and residing at Dusseldorf, Germany,- harc invented a certain new and useful I] m proved Process of scribed a process by which a magnesium perborate of good solubility and constant chemical composition canbe made by melting a.

mixture composed of a, i'ua'gncsium salt and an alkali metal perborate. I have now found that perborate of zinc can be made by replacing the magnesium salt by the'correspending zinc salt.

' perborate ltxample: 1 molecular proportion o1 zinc sulfate ZuSo,.7I'l. is intimately mixed with 2 molecular proportions of sodium NaBO,,.4ll 0, the mixture is melted at a temperature of about 70 (3. on the water-bath and kept-at thistenmerature for a considerable timeavliilebeing stirred. On' cooling, the [mass congeals fairly rapidly, has a uniform crumbly appearance and can be veryreadily pulverized after being completely dried. The product obtained is a perfectly White amorphous owder of uniform composition.

The yield of active oxygen is almost quantitative in this process, and the new product is exceedingly stable.

" As in the manufacture of maghesiinn per- ,borate, the advantage of the herein described process of manufacturingperborate of zinc is its exceedingly great simplicity and'short duration, as wellas theresultiug constant chemical composition of the final products.

In consequence of the combination ol the high percentage of oxygen with the wellknown action of the boracic acid and Zlllu compound, perborate of zinc is excellently adapted for pharmaceutical ,purposes.

, Specification of Letters Patent. Patented In '15 191 4 Application filed February 9, 1914. Serial No. 817,699.

1. A process of manufacturing perborate' of zinc consisting; in meltingand simultaneously stirring an alkali metal perborate with a zinc salt \Vl'l OSB'flDlODS are able to form with the alkali metal of the perborate, salts containing water-o1" crystallization.

' 2, A process of manufacturing perborate of zinc consisting in melting sulfate of zinc with an alkali. metal perborate While stirring the same.

3. A- process of manufacturing perborate of zinc consisting in melting sodium perborate with a zinc salt whose anions are able to form with the alkali metal of the perborate, salts containing water of crystallization. n

4. A process of manufacturing perborate of zinc consisting in melting zine sulfate with sodium perho ate while constantly stirring the same.

5. A process of manufacturing perborate of zinc consisting in mixing 2 molecular proportions of an alkali metal perborate with 1 molecular proportion of a Zinc salt whose anions are able to form with the alkali perbo'rate, salts containing water of crystalliza.

tion, in melting the mixture at a temperature of from .65 to 70 C. and in maintaining it at this temperature for .a time While'stirring the same. and in then allowing'the'molten mixture to. cool. v

6. A-process of manufacturing perborate of zinc consisting in mixing 1 molecular proportion ofzinc sulfate with 2 molecular proportions of sodium perborate, in melting themixturc at a temperature from to C.- aud in. maintaining it at thls tempera;

'ture 'for a, time while stirring the same, and

in then allowing; the molten mixture to cool.

ln testjmonv whereof I ali'i'x m si nature-iu the presence of two witnesses. VAT/PER WEBER. s] Witnesses: 4 Human N UFER,

Anm in'r NUFER. 

